SAT II Chemistry Exam Prep

Category - Multiple Choice

Which of the following molecules displays planar geometry?
  1. NH3
  2. BH3
  3. XeO4
  4. CH4
  5. SiF6
Explanation
Answer: BH3

NH3 has three bonding hydrogens and a lone pair of electrons, giving it trigonal pyramidal geometry. XeO4 has four bonding oxygens and thus tetrahedral geometry. Similarly, CH4 has four bonding hydrogens and tetrahedral geometry. SiF6 has six bonding flourines, and octahedral geometry. BH3 has just three bonding hydrogens and no lone pairs of electrons, therefore displaying trigonal planar geometry.
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